CR-301 High Temperature/Pressure LPR Corrosion Rate Sensor
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CR-301
High Temperature/Pressure LPR Corrosion Rate Sensor
LPR Corrosion Sensors -vs- Corrosion Coupons
The use of the LPR corrosion rate represents a valuable tool that can be easily and
affordably deployed to provide both general and localized corrosion measurements
in an instantaneous format. There is a common industrial misnomer that the use of
inline LPR corrosion sensors should be identical to that of corrosion coupons. The
LPR corrosion level represents the real-time electrochemical measurement of
corrosion. While it may be linear with respect to the corrosion rate obtained from
the weight loss of a coupon exposed to water for a long period, the LPR corrosion
rate may not necessarily be the same exact value of the latter. The instantaneous
nature of the device general corrosion measurement represents a “real-time
condition” on a Mils-Per-Year (MPY) scale (1 Mil = 1/1,000 inch) based on the
specific metallurgy being assessed and will in many cases vary, in a short time scale,
from a corrosion coupon. The LPR data should be used to best understand the linear
relationship with coupons and for real-time application performance assessment
and adjustment.
The Pyxis CR-301 corrosion rate sensor is ideal for extreme environmental and
sample conditions in process application monitoring where robustness and
affordability are a must. The sensor utilizes the linear polarization resistance (LPR)
method to produce a raw signal. The raw signal is conditioned, amplified, and
digitized directly in the sensor itself. This avoids the interferences and attenuation
of the raw signal caused by long-distance wiring needed for other corrosion probes
to a separate signal conditioner or transmitter box. The Pyxis CR-301 corrosion
sensor measure sample water conductivity directly and compensate for the
conductivity impact on the LPR measurement. These unique product characteristics
make the Pyxis LPR superior in performance and accuracy. In addition to the LPR
measurement to obtain the general corrosion rate, the CR-301 sensor also
measures electrochemical noise. The measured noise data is used to calculate an
index to quantify the localized corrosion rate also referred to as pitting. CR-301
CR-301 Typical Applications
• High Temperature / High Pressure Applications
• Geothermal - Process
• District Energy - Heating
• Oil & Gas – Process / Produced Water
1729 Majestic Drive Suite 5, Lafayette, CO 80026 | service@pyxis-lab.com | +1(866)203-8397
Features
The CR-301 is a standalone high temperature and high pressure rated LPR corrosion sensor that can be
powered by a 24 VDC power source such as an existing controller, PLC or DCS. The sensor is composed of
Titanium and PEEK (Polyether Ether Ketone) making it highly resilient to extreme process environments,
temperatures and pressures. The CR-301 also offers an expanded general corrosion range as high as 995 mils
per year and localized corrosion index as high as 100.
When used with the provided MA-CR Pyxis Bluetooth Adapter, the CR-301 must be configured via the uPyxis
APP for Mobile or Desktop devices. The uPyxis app is used to configure the CR-301 for the metallurgy desired,
assign a sensor identification name, obtain live sensor readings. Default measurement ranges and alloy
factors will be applied to the CR-301 via the uPyxis APP when the user selects the metallurgy desired. Custom
alloy factors and ranges of measurement may be adjusted if desired. Additional diagnostic information is
available and can be used for determining the sensor performance or the need for maintenance.
• Anti-electromagnetic interference (anti-EMI) design with Titanium sensor body
• 2x 4-20mA Outputs (General Corrosion and Localized Corrosion)
• RS-485 Modbus Output
• Integrated Cooling Fin Design for High Temperature Applications
• Bluetooth connectivity to uPyxis app when used with MA-CR Adapter
• Default 4-20-mA Output scales and Alloy Factors assigned for selected metallurgy via uPyxis
• Customization of Alloy Factor and upper MPY / Index (20mA) scale as desired via uPyxis
• Ultra-low general corrosion rate detection down to 0.001 MPY
uPyxis APP Configuration
The uPyxis APP manages all Pyxis portable meter and inline sensors on mobile and
desktop devices, including Apple iPhones and Samsung Android smartphones. When
connected to the Pyxis CR series corrosion rate sensors, the uPyxis APP enables users
to configure the sensor for the specific metallurgy desired as well as name the sensor,
system and data log frequency in addition to offering live corrosion rate data trending.
For wireless access to CR-301, the MA-CR Bluetooth Adapter will be required. One
MA-CR adapter is provided with the purchase of each CR-301. *Note* The uPyxis
Mobile APP is evolving rapidly and users can find the latest version at no cost on Apple
iStore or Google Play. The uPyxis Desktop APP may be downloaded at https://pyxis-
lab.com/support-2/
1729 Majestic Drive Suite 5, Lafayette, CO 80026 | service@pyxis-lab.com | +1(866)203-8397
CR-301 Dimensions (in/mm)
Installation Format Recommended
FLOW
1729 Majestic Drive Suite 5, Lafayette, CO 80026 | service@pyxis-lab.com | +1(866)203-8397
Specifications
Item CR-301
P/N 51021
General Corrosion Range - MPY 0.001-995
(4-20mA Output) (Default Assigned MPY is Customizable Via uPyxis)
Resolution 0.001 MPY or 1% of Reading
Localized Corrosion Range – Index 0.001-100
(4-20mA Output) (Default Assigned Index is Customizable Via uPyxis)
Conductivity Compensation 10-50,000uS/cm
3 to 1440 Minutes
Reading Interval
(>3 Minutes Required for Localized Corrosion Data)
0–3
Alloy Factor Range
(Adjustable Default Assigned via uPyxis on Metallurgy UNS Code)
Power Supply 24V DC,2W
Output RS-485 and 4-20 mA Dual Output
Weight 1150g
Dimensions (L x D) 280mm L X 52mm D
Installation 3/4” NPT
Enclosure Material Titanium + PEEK
Operating Pressure Up to 500 psi (34.5 bar)
Operating Temperature -10 – 240oC (14 – 464oF)
Storage Temperature -20 – 70oC (-4 – 158oF)
Cable Format 8Pin - 5 ft. (1.5 m),
(Extension Cables Available)
Protection IP68
Regulation CE / RoHS
1729 Majestic Drive Suite 5, Lafayette, CO 80026 | service@pyxis-lab.com | +1(866)203-8397
CR-301 - Wired / 24VDC LPR Corrosion Sensor Package (P/N 51021)
• The package should include one CR-301 sensor, a 5-foot extension cable terminated with
connectors, a 2-foot flying lead cable with one end terminated with a connector
• One Bluetooth Adapter for CR-301 (P/N: MA-CR)
• One Bluetooth Adapter for PC (P/N: MA-NEB)
• One pair of copper (P/N: 51003) and one pair of mild steel electrodes (P/N: 51002)
• One 2.0 MPY Calibration Check/verification cap (P/N: 51010)
• One 0.1 MPY Calibration Check/verification cap (P/N: 51011)
• Operation Manual is also available for download at http://www.pyxis-lab.com/s upport.html
CR-Series Accessories
PYXIS CORROSION SENSOR ACCESSORIES
Accessory Name / Description Part # Photo
MA-10CR - 10' Cable for CR300 LPR Sensor 50741
MA-20CR - 20' Cable for CR300 LPR Sensor 50742
MA-50CR - 50' Cable for CR300 LPR Sensor 50743
MA-100CR - 100' Cable for CR300 LPR Sensor 50744
MA-4.9CR - 4.9 ' Cable For CR300 LPR Sensor 50745
MA-1.5CR - 1.5 Meter Connection Cable For CR300 w Flying Leads 50746
CR-200 3.6V ER26500 Battery 50730
2.0 MPY Calibration Cap 51010
0.1 MPY Calibration Cap 51011
CR-Series Bluetooth Adapter - 8Pin MA-CR
CE-01 Mild Steel Electrode Pair 51002
CE-02 Copper Electrode Pair 51003
1729 Majestic Drive Suite 5, Lafayette, CO 80026 | service@pyxis-lab.com | +1(866)203-8397
Test Metal Electrodes Offered via uPyxis APP
The uPyxis APP manages all Pyxis portable meter and inline sensors on mobile and desktop devices, including
Apple iPhones and Samsung Android smartphones. When connected to the Pyxis CR series corrosion rate
sensors, the uPyxis APP enables users to configure the sensor for the specific metallurgy desired as well as
name the sensor, system and data log frequency in addition to offering live corrosion rate data trending. The
uPyxis APP also allows users to add customized metallurgies, general corrosion rate range, localized corrosion
index and alloy factors. *Note* The uPyxis Mobile APP is evolving rapidly and users can find the latest version
at no cost on Apple iStore or Google Play. The uPyxis Desktop APP may be downloaded at https://pyxis-
lab.com/support-2/
Default 4-20mA Default 4-20mA
Common Designation UNS Alloy Factor General Corrosion Localized Corrosion
Scale (MPY) Scale (Index)
Aluminum AA1100 A91100 0.94 0-50 0-100
Aluminum AA6061 A96061 0.94 0-50 0-100
Aluminum AA2024 A92024 0.86 0-50 0-100
Cu/Ni - 70/30 C71500 1.50 0-5 0-10
Copper 110 ETP C11000 2.00 0-5 0-10
CDA 687 Aluminum Brass Arsenical C68700 1.62 0-5 0-10
CDA 642 Aluminum Silicon Bronze C64200 1.48 0-5 0-10
Arsenical Admiralty Brass CDA443 C44300 1.67 0-5 0-10
Phosphorized Admiralty Brass CDA445 C44500 1.68 0-5 0-10
Pipe Grade Carbon Steel A135 1.00 0-50 0-100
Mild Steel C1010 G10100 1.00 0-50 0-100
Mild Steel C1015 G10150 1.00 0-50 0-100
Mild Steel C1018-C1020 G10180 1.00 0-50 0-100
Mild Steel C1080 G10800 1.00 0-50 0-100
Stainless Steel 304 S30400 0.89 0-2.5 0-10
Stainless Steel 304L S30403 0.89 0-2.5 0-10
Stainless Steel 316 S31600 0.90 0-2.5 0-10
Stainless Steel 316L S31603 0.90 0-2.5 0-10
Duplex Stainless 2205 - F51 S31803 0.90 0-2.5 0-10
Duplex Stainless 2507 - F53 S32750 0.90 0-2.5 0-10
Common Lead L50045 2.57 0-2.5 0-1
*NOTE* LPR Electrode Notes - Metal electrodes with a different length and a slightly different diameter may be used
with the CR-200/300 sensor if the electrodes have a 4-40 internal thread and has a surface are of 5 cm 2. The alloy
factor for a given metal alloy is proportional to the surface area of the electrode. If an electrode with a surface area
different than 5 cm2 (0.736 square inch) is used, the user will need to calculate the proper alloy factor according to
the surface area and the default 5cm2 alloy factor listed above.
1729 Majestic Drive Suite 5, Lafayette, CO 80026 | service@pyxis-lab.com | +1(866)203-8397
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